The verbs être, avoir and savoir are irregular in L'Impératif Présent.
Learn how to conjugate ÊTRE (to be), AVOIR (to have) and SAVOIR (to know) in L'Impératif Présent in French
être | avoir | savoir | |
(tu) | sois | aie | sache |
(nous) | soyons | ayons | sachons |
(vous) | soyez | ayez | sachez |
On their own, they're not terribly useful, but they are essential to express some commands or advice.
See also these other lessons on L'Impératif Présent :
Conjugate regular verbs in the imperative mood in French (L'Impératif)
Conjugate irregular être/avoir/savoir in the imperative mood in French (L'Impératif)
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